chandni nigam , 19 , spent six years battling demons which spawned from obsession to do well at school , an inquest into her death was told .
miss nigam would stay up late studying , resulting in sleep deprivation and a negative impact on her performance at school - which further depression and anxiety .
berkshire coroner peter bedford heard the teenager , who had been a volunteer at the london olympics in 2012 , was also worried about her appearance .